RC减震结构中震设计简化分析研究  

Simplified Analysis and Study on Moderate Earthquake Design of RC Energy Dissipation Structure

作　　者：马振霄 温文露 管庆松 潘文[2] 陈华霆 MA Zhenxiao;WEN Wenlu;GUAN Qingsong;PAN Wen;CHEN Huating(QuakeSafe Technologies Co.,Ltd.,Kunming 650217,China;School of Construction Engineering,Kunming University of Science and Technology,Kunming 650233,China;State Key Lab for Seismic Reduction Control&Structural Safety(Cultivation),Guangzhou University,Guangzhou 510405,China)

机构地区：[1]震安科技股份有限公司,云南昆明650217 [2]昆明理工大学建筑工程学院,云南昆明650233 [3]广州大学减震控制与结构安全国家重点实验室(培育),广东广州510405

出　　处：《防灾减灾工程学报》2022年第6期1304-1313,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：云南省科技厅重点研发计划项目(202003AC100001);国家自然科学基金委员会青年项目(51808154)资助。

摘　　要：为探究中震设计与现行小震设计在性能指标上的差异,首先分析了整体中震设计与小震设计在概念上的区别,对比了这两种理念下结构构件的内力放大情况,进而从宏观上把握不同设计方法对结构整体和构件层面的影响;其次基于加速度设计反应谱和位移设计反应谱推导了中震作用下单自由度简化体系总等效阻尼的表达式,理论分析了中震等效阻尼与结构层间位移、设防烈度、结构周期及“周期比”的关系,并进行了简单的证明;给出不同设防烈度下该简化体系的中震总等效阻尼比和刚度的速查表格,便于快速评估多层规则结构的中震阻尼和刚度需求;最后结合黏滞阻尼器(1-FVD)、摩擦阻尼器(2-FD)和软钢阻尼器(3-MYD)三个算例对本文提出的中震阻尼和刚度需求评估方法予以展示总结。结果表明,现行小震设计或可满足中震设计的性能要求,其中一、二级一般框架结构的柱构件基本满足中震不屈,一级底层柱满足中震弹性,一级剪力墙构件加强区剪力满足中震不屈;值得注意的是,对低设防烈度、长周期结构,中震附加阻尼比会出现负值和局部震荡现象;通过同时调整附加阻尼和结构刚度进行中震设计的策略相对合理可行;项目前期评估时可通过插值速查表格的方法初步确定附加阻尼比,进而指导减震方案。中震设计的理论分析和工程应用尚显不足,“强柱弱梁”“强剪弱弯”等基本设计原则的满足性问题有待进一步研究。To explore the difference in performance indexes between the medium earthquake design and the current small earthquake design,the conceptual differences between the overall moderate earthquake design and the small earthquake design are analyzed,and the internal force amplification of the structural components under the two concepts is compared firstly.Then,the influence of different design methods on the whole structure and the components is grasped from a macro perspective.Secondly,based on the acceleration design response spectrum and displacement design response spectrum,the expression of the total equivalent damping of the simplified single degree of freedom system under the action of the moderate earthquake is derived,and the relationship between the equivalent damping of the moderate earthquake and inter-layer displacement,intensity of fortification,structure period and‘period ratio’is theoretically analyzed,thereafter a simple proof is carried out.The quick reference table cases under different fortification intensities are given to facilitate the rapid evaluation of the damping and stiffness requirements of the regular multi-layer structure.Finally,three examples based on fluid viscous damper(1-FVD),friction damper(2-FD)and mild steel damper(3-MYD)are utilized to demonstrate and summarize the moderate earthquake damping and stiffness demand assessment methods proposed in this paper.The results show that the current small earthquake design may meet the performance requirements of the moderate earthquake design.The column members of the first-and second-level general frame structures can basically meet the requirements of moderate earthquake design,the first-level floor column meets the moderate earthquake elasticity,and the shear force of the reinforced area of the first-level shear wall member can meet the performance requirements of the moderate earthquake design.It’s worth noting that negative values and local oscillations of damping ratio will occur under the action of a moderate earthquake for l

关 键 词：反应谱 内力调整 中震弹性设计 中震不屈设计 减震 

分 类 号：TU318[建筑科学—结构工程]